Functions

• Similar to other languages
• It can receive arguments
• Arguments can have default values
• The last argument can be of variable length

The tricky part

- Functions can return more than one value (at once)
- Functions can return labeled variables
- Functions receive arguments always by value

func add(a int, b int) int {
    return a+b;
}

func addAndSubstract(a int,b int)(int,int){
    return a+b,a-b
}

addition, substraction := addAndSubstract(4,2)
_, substraction := addAndSubstract(4,2)
addition, _ := addAndSubstract(4,2)

Functions receiving references

One package one main()

func birthday(age *int){
    age = *age + 1
}

func main(){
    age := 22
    birthday(&age)
    fmt.Prinln(age)
}

Functin Curiosity

• panic("Message!") // It will close your app
• defer fmt.Println("bye") // It will delay execution to the end. It uses stack data structure
• init() //

Errors Design Pattern

We don’t have exceptions in GO, this is the typical design pattern when an action may trigger an error.